The more we learn about Donald Trump’s baseless, false and discredited claims about the 2020 election, the more baseless, false and discredited those claims have become. Just consider the revelations over the past week — from Republicans: In Michigan, a GOP-led investigation by its state Senate concluded that it “found no evidence of widespread or systematic fraud in Michigan’s prosecution of the 2020 election.” (Remember, Biden won Michigan by more than 150,000 votes.) Regarding Arizona, a report co-authored by former Kentucky Secretary of State Trey Grayson criticized the so-called “audit” of the election results in that state, saying it “does...